genjavadoc plugin breaking publish nightly job

[pjfanning]

Not yet published for Scala 2.13.16

https://github.com/apache/pekko/actions/runs/12728852719/job/35479939070

[raboof]

lightbend/genjavadoc#376

[raboof]

earlier we'd have caught this in #1704 because the link validator also runs with genjavadoc, but we moved that to nightly. Perhaps we should enabled it in one of the sbt invocations in binary-compatibility-checks.yml?

[pjfanning]

I just think in future, we shouldn't manually update Scala. We should wait for Scala Steward. It appears to have some set up that holds it back from recommending Scala updates until the sbt tooling catches up.

[He-Pin]

Not sure why genjavadoc need be updated for every scala release.

[raboof]

Not sure why genjavadoc need be updated for every scala release.

Because it hooks into compiler internals that may change between Scala releases, so may need changes between them. Such changes are not always needed, but they're erring on the safe side.

[pjfanning]

Our builds in other Pekko repos are also affected. The main branch snapshots now have a dependency on scala-library 2.13.16 and sbt blows up when the scala version is less than the transitive dependency version of scala-library.

eg https://github.com/apache/pekko-connectors-kafka/actions/runs/12759834551/job/35564242431

I am tempted to revert #1704 and reapply it when we start seeing scala steward updating the downstream repos.

[He-Pin]

It's been released, and is now green.